7.3.2 Data Isolation Channel Signal Transmission

The AMC3301-Q1 uses an on-off keying (OOK) modulation scheme to transmit the modulator output bitstream

The transmitter modulates the bitstream at TX IN with an internally generated, 480-MHz carrier and sends a

burst across the isolation barrier to represent a digital one and sends a no signal to represent the digital zero.

The receiver demodulates the signal after advanced signal conditioning and produces the output. The

symmetrical design of each isolation channel improves the common-mode transient immunity (CMTI)

performance and reduces the radiated emissions caused by the high-frequency carrier.

TX IN

Oscillator

OOK

Modulation

Transmitter

TX Signal

Conditioning

Envelope

Detection

RX Signal

Conditioning

Receiver

RX OUT

Capacitive

Reinforced

Isolation

Barrier

Figure 7-1. Block Diagram of a Data Isolation Channel

Figure 7-2 shows the concept of the OOK scheme.

TX IN

Carrier Signal Across

the Isolation Barrier

RX OUT

Figure 7-2. OOK-Based Modulation Scheme

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AMC3301-Q1

SBASA73 – JULY 2020

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